Features removal for version 3.0
Unused or seldom used features to be removed as part of the cleanup task for each new version. Candidates:
- Folders app. Replaced with the Cabinets app.
- Django GPG app. Handles cryptographic keys, used by the document_signatures app.
- Document signatures. Not used by home users, removed and provide as a separate app.
- Statistics app.
- Data filters.
- Document checkouts.